Legacy code cleanup - part 3 (#3903)

* Legacy cleanup - part 3

Not much is left that can be easily removed,
so I think this will be last cleanup before the legacy functionality is replaced.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* fix windows build, remove a few more things, re-add one file

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Remove legacy RenderBus + more cleanups

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Remove MaterialOwnerBus.h

Clean-up in Cry_Matrix34/33

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Code/Legacy/CryCommon/ILevelSystem.h

@@ -8,13 +8,8 @@
 
 
 // Description : Gathers level information. Loads a level.
-
-
-#ifndef CRYINCLUDE_CRYACTION_ILEVELSYSTEM_H
-#define CRYINCLUDE_CRYACTION_ILEVELSYSTEM_H
 #pragma once
 
-#include <CrySizer.h>
 #include <IXml.h>
 #include <AzCore/Asset/AssetCommon.h>
 
@@ -56,8 +51,6 @@ struct ILevelSystemListener
     virtual void OnLoadingProgress([[maybe_unused]] const char* levelName, [[maybe_unused]] int progressAmount) {}
     //! Called after a level is unloaded, before the data is freed.
     virtual void OnUnloadComplete([[maybe_unused]] const char* levelName) {}
-
-    void GetMemoryUsage([[maybe_unused]] ICrySizer* pSizer) const { }
 };
 
 struct ILevelSystem
@@ -95,5 +88,3 @@ protected:
 
     static constexpr const char* LevelsDirectoryName = "levels";
 };
-
-#endif // CRYINCLUDE_CRYACTION_ILEVELSYSTEM_H